C8051F58X Datasheet, PDF (216/356 Pages) Silicon Laboratories – Programmable hysteresis and response time Configurble as interrupt or reset source Low current

C8051F58x/F59x
Table 21.3. Autobaud Parameters Examples
System Clock (MHz)
25
24.5
24
22.1184
16
12.25
12
11.0592
8
Prescaler
1
1
1
1
1
0
0
0
0
Divider
312
306
300
276
200
306
300
276
200
21.3. LIN Master Mode Operation
The master node is responsible for the scheduling of messages and sends the header of each frame con-
taining the SYNCH BREAK FIELD, SYNCH FIELD, and IDENTIFIER FIELD. The steps to schedule a mes-
sage transmission or reception are listed below.
1. Load the 6-bit Identifier into the LIN0ID register.
2. Load the data length into the LIN0SIZE register. Set the value to the number of data bytes or "1111b" if
the data length should be decoded from the identifier. Also, set the checksum type, classic or
enhanced, in the same LIN0SIZE register.
3. Set the data direction by setting the TXRX bit (LIN0CTRL.5). Set the bit to 1 to perform a master
transmit operation, or set the bit to 0 to perform a master receive operation.
4. If performing a master transmit operation, load the data bytes to transmit into the data buffer (LIN0DT1
to LIN0DT8).
5. Set the STREQ bit (LIN0CTRL.0) to start the message transfer. The LIN controller will schedule the
message frame and request an interrupt if the message transfer is successfully completed or if an error
has occurred.
This code segment shows the procedure to schedule a message in a transmission operation:
LIN0ADR
LIN0DAT
LIN0ADR
LIN0DAT
LIN0ADR
LIN0DAT
= 0x08;
// Point to LIN0CTRL
|= 0x20;
// Select to transmit data
= 0x0E;
// Point to LIN0ID
= 0x11;
// Load the ID, in this example 0x11
= 0x0B;
// Point to LIN0SIZE
= ( LIN0DAT & 0xF0 ) | 0x08;
// Load the size with 8
LIN0ADR = 0x00;
for (i=0; i<8; i++)
{
LIN0DAT = i + 0x41;
LIN0ADR++;
}
LIN0ADR = 0x08;
LIN0DAT = 0x01;
// Point to Data buffer first byte
// Load the buffer with ‘A’, ‘B’, ...
// Increment the address to the next buffer
// Point to LIN0CTRL
// Start Request
216
Rev. 1.2